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Qingdao version of fourth grade science volume 1, plant leaves PPT courseware
Part One: Study Materials
Guess: Why are plant leaves generally green?
Plants generally contain chloroplasts, which produce chlorophyll.
Information 1
In 1642, the Belgian scientist Helmand potted a willow seedling weighing 2.3 kilograms and only watered it with rainwater (the rainwater contained almost no nutrients) without any fertilizer. Five years later, the willow seedlings grew into willow trees, gaining 34 times their weight, but the pot soil only lost 0.57 grams.
What did the experiment show?
Information 2
In 1771, British scientist Priestley put green plants and mice in a bell jar. Under light conditions, the mice could live normally.
What did the experiment show?
Plant leaves PPT, part 2: summary
Summary: Experiments have proven that most of the nutrients needed for plant growth are provided by green leaves.
Under sunlight, chloroplasts can synthesize the nutrients needed by plants by combining water absorbed by the roots and carbon dioxide entering through the stomata, and at the same time release oxygen. ——This function of leaves is called photosynthesis.
What is the significance of photosynthesis in leaves?
Answer: The photosynthesis of leaves not only produces nutrients for plants, but also provides nutrients and oxygen for the survival of animals and humans.
Plant leaves PPT, part 3 content: Classroom exercises
practice
1. Let me fill it in.
(1) Most of the nutrients needed for plant growth are produced by _____.
(2) _____ can produce chlorophyll, so leaves are generally green.
(3) Each chloroplast is a small "_____ processing factory". Under the irradiation of sunlight, chloroplasts can synthesize the nutrients needed by the plant by combining _____ absorbed by the roots and ____ from the stomata, and at the same time release __. This function of leaves is called _____.
2. Be a good little judge.
(1) Photosynthesis must occur under sunlight. ( )
(2) All the nutrients needed by plants come from the soil. ( )
(3) If you observe the internal structure of leaves under a microscope, you will find that there are many green particles in the leaves, and these particles are chloroplasts. ( )
Keywords: Qingdao edition fourth grade science PPT courseware free download, plant leaves PPT download, .PPT format;
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